EP0486848B1 - Relative speed or position for a damper piston moving inside a damper body - Google Patents
Relative speed or position for a damper piston moving inside a damper body Download PDFInfo
- Publication number
- EP0486848B1 EP0486848B1 EP91118384A EP91118384A EP0486848B1 EP 0486848 B1 EP0486848 B1 EP 0486848B1 EP 91118384 A EP91118384 A EP 91118384A EP 91118384 A EP91118384 A EP 91118384A EP 0486848 B1 EP0486848 B1 EP 0486848B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- winding
- permanent magnet
- piston rod
- damper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
- B60G17/019—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the type of sensor or the arrangement thereof
- B60G17/01933—Velocity, e.g. relative velocity-displacement sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
- G01P3/52—Devices characterised by the use of electric or magnetic means for measuring linear speed by measuring amplitude of generated current or voltage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/11—Mounting of sensors thereon
- B60G2204/112—Mounting of sensors thereon on dampers, e.g. fluid dampers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
- B60G2400/20—Speed
- B60G2400/202—Piston speed; Relative velocity between vehicle body and wheel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
- B60G2600/22—Magnetic elements
- B60G2600/24—Magnetic elements permanent magnets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2230/00—Purpose; Design features
- F16F2230/08—Sensor arrangement
Definitions
- the invention relates to a sensor for measuring the relative speed and / or the position between a damper cylinder and a damper piston of a vibration damper or spring strut for motor vehicles connected to a piston rod and moving therein.
- Vibration dampers or struts of this type are used as links for transmitting the vibrations from the road surface to the body via the wheel spring system, struts being used in particular for the front axle of the motor vehicle. Vibration dampers and struts with semi-active or active damping control are very often used to ensure a high level of driving comfort and greater driving safety.
- the sensor consists of a cylindrical coil, which is located in the cover connected to the piston rod, and a permanent magnet, which is located on the guide closure side of the Damper cylinder is arranged.
- the sensor delivers a signal for the relative speed via the induced voltage in the sensor winding. A measurement and thus an adjustment of the extension and extension stroke of the damping piston is not possible.
- DE-OS 29 11 768 shows a combination of several sensor windings and permanent magnets for measuring the end position and for measuring the movement or the speed of the parts moving relative to one another.
- the sensor system for measuring the end position ie the limit value
- the system for measuring the speed is designed as a further sensor winding with a corresponding magnet which is formed over a long length.
- the invention has for its object to provide a sensor for a vibration damper and a shock absorber of a motor vehicle with which, in addition to the relative speed between the body and the axle, the end position of the entry and exit stroke can also be measured.
- the object is achieved by a sensor for measuring the relative speed and / or the position between a damper cylinder and a damping piston moving in it according to the features of the claims.
- the sensor winding can be received by the cover connected to the piston rod and the permanent magnet can be arranged on or in the wall of the damper cylinder.
- Another option is there This involves inserting the sensor winding into the wall of the damper cylinder made of non-magnetizable material or, in the case of a two-tube damper, arranging it between the wall of the damper cylinder and the outer tube and connecting the permanent magnet to the damping piston or to the part of the piston rod immersed in the damper cylinder.
- the sensor winding preferably surrounds the piston rod below the pull stop and the permanent magnet is arranged on or in the wall of the cylinder tube.
- the electrical connections are led through the hollow piston rod to the outside.
- a further embodiment of the sensor for a shock absorber is to arrange the sensor winding axially in the hollow piston rod if it consists of a non-magnetizable material. If the damper cylinder was made of a non-magnetizable material, it is convenient to attach the permanent magnet to the outer wall of the damper cylinder or to the inner wall of the outer tube, with the opposite design, the sensor winding being a cylindrical coil between the outer wall of the damper cylinder made of non-magnetizable material and to arrange the inner wall of the outer tube and the permanent magnet on the piston rod is possible.
- the end position of the entry and exit stroke indicating separately tapped, increased induced voltage at the ends of the sensor winding is realized by an increased number of turns per unit length in the end regions.
- Another advantageous embodiment consists of winding the sensor winding in multiple layers in the end regions or making the windings closer together.
- a very accurate measurement signal is obtained when the part carrying the permanent magnet and the part carrying the sensor winding form a closed magnetic circuit for the magnetic field of the permanent magnet and the permanent magnet, for example in the form of a ring magnet, is radially polarized in an arrangement relative to the piston rod.
- the permanent magnet can also consist of individual magnets arranged in a ring.
- the simply constructed passive sensor according to the invention can be used without reducing the sliding length of the vibration damper or the shock absorber.
- the hydraulic, controllable vibration damper shown in Figure 1 consists essentially of a damper cylinder 1, which is closed by a guide lock 5, a damper piston 3 connected to a piston rod 2 and a cover 4 made of non-magnetizable material connected to the piston rod 2.
- a damper cylinder 1 In the damper cylinder 1 there are two working spaces, which are separated by the separating piston 6 from a gas-filled compensation space, which serves to compensate for the volume increase or decrease in the hydraulic working space by the retracting or extending volume of the piston rod 2.
- Above the separating piston 6 is the damper piston 3, firmly connected to the movable piston rod 2, which slides through the guide closure 5 and is sealed by a seal.
- the cover 4 made of non-magnetizable material is designed such that it is open on one side and placed over the damper cylinder 1.
- a one-piece sensor winding 9 is embedded in the cover 4 and extends over the entire length of the cover 4.
- two measuring windings 7, 8 formed in one piece with the sensor winding 9 are located on the sensor winding 9 at the lower and upper ends of the cover 4.
- the length of these measuring windings 7, 8 is small compared to the length of the sensor winding 9.
- the permanent magnet 10 sliding through the sensor and measuring windings was arranged on the guide closure 5. There is an air gap between the permanent magnet 10 and the sensor 9 and measuring windings 7, 8.
- the permanent magnet 10 moves upward within the sensor winding 9 surrounding it and a voltage is induced in the sensor winding 9.
- This voltage signal within the sensor winding 9 is proportional to the relative speed of the damper cylinder 1 and the piston 3.
- the permanent magnet 10 reaches the end of the sensor winding 9, a voltage is induced in the measuring winding 7, which causes the end position of the permanent magnet 10 and thus the permissible end position of the Damper piston 3 signals.
- the lower possible extension position is detected in the same way by the lower measuring winding 8.
- the connections of the sensor and measuring windings are led to evaluation electronics, not shown.
- FIG. 2 illustrates the structure of the upper part of the sensor winding 9, which is made in one piece with the measuring winding 7, the tap 14 of the measuring winding 7 and the connection 13 of the sensor winding 9 being led to the outside. It can also be useful to arrange a non-magnetizable intermediate layer 12 between the guide closure 5 and the permanent magnet 10, which prevents the magnetic force from being weakened by the iron of the damper cylinder.
- the system of sensor and measuring windings is located on the wall of the damper cylinder 1, which is made of non-magnetizable material and was covered with a dielectric to protect it against external influences. It would also be conceivable to arrange the sensor and measuring windings directly in the wall of the damper cylinder 1.
- the permanent magnet 10 for generating the induction voltage is located on the damper piston 3 or on the lower part of the piston rod 2. Here, too, a voltage proportional to the relative speed is induced in the sensor winding 9 and a detection signal for the end positions of the retracting and extending stroke is induced in the measuring windings 7 and 8 .
- Fig. 4 shows a vibration damper, which is constructed in opposite directions.
- the sensor winding 9 formed in one piece with the measuring windings 7, 8 is located on or in the wall of the damper cylinder 1 made of non-magnetizable material.
- the permanent magnet 10, which is designed in particular as a ring magnet, was arranged on the cover 4 and is thus connected to the piston rod 2 via it. Due to the same induction principle, a voltage proportional to the relative speed is induced in the sensor winding 9 during a relative movement between the damper cylinder 1 and damper piston 3, and an identification signal for the end positions of the damper piston 3 is generated by the permanent magnet 10 when passing through the measuring winding 7 or 8.
- the damping can be switched to a higher damping value by means of a control, the damping cylinder slows down on the buffer 11 and the vibration damper is prevented from striking through.
- the working space 18 which is formed by the damper cylinder 1 and is delimited at the lower end by the bottom valve 19 and at the top by the guide lock 5.
- the piston rod 2 which receives the damping piston 3 equipped with controllable or controllable valves in the working area.
- the damper cylinder 1 is surrounded by an outer tube 17, between the two is the compensation chamber 20, which is filled to about half the height with oil, while the working chamber 18 is full of oil.
- the outer tube 17 connects the guide closure 5 to the bottom cap 21 supporting the bottom valve 19 and carries the spring plate 22 which receives a helical spring (not shown).
- the piston rod 2 carries a pull stop 16.
- one-piece sensor winding 9 surrounds the piston rod below the pull stop 16.
- the length of these windings 7, 8 is small compared to the length of the sensor winding 9.
- the one surrounding the sensor winding 9 and the windings 7, 8, for example A permanent magnet 10 designed as a ring magnet was arranged on the inner wall of the damper cylinder 1. If the damping cylinder 1 consists of non-magnetizable material, the permanent magnet 10 can be arranged between the outer wall of the damper cylinder 1 and the inner wall of the outer tube 17.
- the damper cylinder 1 is pulled down together with the outer tube 17 and the permanent magnet 10 moves downward around the sensor winding 9. Through this movement, he induces a voltage in the sensor winding 9 proportional to the relative speed between the damping piston 3 and the damper cylinder 1. However, when the permanent magnet 10 reaches the end of the sensor winding 9, a voltage is also induced in the winding 7, which is the end position of the permanent magnet and thus signals the permissible end position of the rebound path. The permissible end position of the deflection path is indicated by the winding 8.
- the suspension strut in FIG. 6 has a similar structure to the suspension strut in FIG. 5.
- the piston rod 2 was here made of non-magnetizable material, for example non-magnetizable chromium-nickel steel, and the sensor winding 9 with the windings 7, 8 was arranged axially in the hollow piston rod 2 for detecting the end positions of the inward and outward stroke.
- the connections of the windings are led to the outside together with the connections 24 of the controllable solenoid valve 23 in the hollow piston rod.
- the permanent magnet 10 for generating the induction voltage is also located on the inner wall of the damper cylinder 1.
- Fig. 7 shows a shock absorber, which is constructed in opposite directions.
- the sensor winding 9 and the windings 7, 8 for detecting the inward and outward stroke lie on the outer wall of the damper cylinder 1, which is made of non-magnetizable material, it being conceivable to arrange the windings on the inner wall of the outer tube 17 as well.
- the connections 10 of the windings were led to the outside in the compensation space 20 and with a multipole plug 25 arranged in the guide lock 5 connected.
- the hydraulic vibration damper shown in Fig. 8 consists essentially of a damping cylinder 1, which is closed by a guide lock 5, a guided in the damper cylinder 1, made of steel piston rod 2, which carries a not shown damping piston at its lower end, and a cover 4, which is placed over the damping cylinder 1 and is open on one side.
- the very precisely working sensor integrated in the vibration damper for measuring the relative speed and / or the piston position in the damper cylinder 1 consists of a radial one to the piston rod 2
- Polarized permanent magnet 10 designed as a ring magnet, which is magnetically separated from the damper cylinder 1, which is usually made of steel, by a disk 26 made of non-ferromagnetic material, for example aluminum.
- the permanent magnet 10 can then be integrated in the guide closure 5.
- the sensor winding 9 which interacts with the permanent magnet 10 and has measuring windings 7, 8 arranged at its ends is arranged on the inner wall of the cover 4 which is made of a ferromagnetic material, usually steel.
- the damper cylinder 1 moves relative to the piston rod 2 and thus to the sensor winding 9 and the measuring windings 7, 8, which is connected to it due to a bump in the road surface
- the magnetic field of the permanent magnet 10 induces a voltage in the sensor winding 9 due to the closed magnetic circuit which is formed by the radially polarized permanent magnet, the piston rod and the cover, which is very precisely proportional to the relative speed of the vehicle body and axle.
- An exact signal for detecting the end positions of the damping piston 3 is thus obtained in the measuring windings 7, 8.
- Magnetic stray fluxes which can lead to an inaccuracy of the measurement result, do not occur.
Description
Die Erfindung bezieht sich auf einen Sensor zur Messung der Relativgeschwindigkeit und/oder der Stellung zwischen einem Dämpferzylinder und einem mit einer Kolbenstange verbundenen, sich in diesem bewegenden Dämpferkolben eines Schwingungsdämpfers oder Federbeins für Kraftfahrzeuge.The invention relates to a sensor for measuring the relative speed and / or the position between a damper cylinder and a damper piston of a vibration damper or spring strut for motor vehicles connected to a piston rod and moving therein.
Derartige Schwingungsdämpfer oder Federbeine werden als Bindeglieder zur Übertragung der Schwingungen von der Fahrbahnoberfläche über das Rad-Federsystem auf die Karosserie eingesetzt, wobei Federbeine insbesondere für die Kraftfahrzeug-Vorderachse zum Einsatz kommen. Zur Gewährleistung eines hohen Fahrkomforts als auch einer größeren Fahrsicherheit werden sehr oft Schwingungsdämpfer und Federbeine mit semiaktiver oder aktiver Dämpfungsregelung eingesetzt.Vibration dampers or struts of this type are used as links for transmitting the vibrations from the road surface to the body via the wheel spring system, struts being used in particular for the front axle of the motor vehicle. Vibration dampers and struts with semi-active or active damping control are very often used to ensure a high level of driving comfort and greater driving safety.
Für eine solche Regelung ist es notwendig, die unterschiedlichsten Bewegungsgrößen, wie Relativgeschwindigkeit zwischen Aufbau und Achse, die Kolbenstellung im Dämpferzylinder oder die Aufbaubeschleunigung, zu messen und auf eine Regeleinrichtung, die eine Stellgröße zur Veränderung der Dämpfungskraft erzeugt, zu führen.For such a control, it is necessary to measure a wide variety of movement variables, such as the relative speed between the body and the axle, the piston position in the damper cylinder or the body acceleration, and to lead it to a control device that generates a manipulated variable to change the damping force.
In der deutschen Patentschrift DE-PS 39 09 190 wird ein Relativgeschwindigkeitssensor für einen Schwingungsdämpfer beschrieben. Der Sensor besteht aus einer zylindrischen Spule, welche sich in der mit der Kolbenstange verbundenen Abdeckung befindet, und einem Dauermagneten, welcher an der Führungsverschlußseite des Dämpferzylinders angeordnet ist. Der Sensor liefert über die induzierte Spannung in der Sensorwicklung ein Signal für die Relativgeschwindigkeit. Eine Messung und damit eine Einstellung des Ein- und Ausfahrhubes des Dämpfungskolbens ist nicht möglich.In the German patent DE-PS 39 09 190 a relative speed sensor for a vibration damper is described. The sensor consists of a cylindrical coil, which is located in the cover connected to the piston rod, and a permanent magnet, which is located on the guide closure side of the Damper cylinder is arranged. The sensor delivers a signal for the relative speed via the induced voltage in the sensor winding. A measurement and thus an adjustment of the extension and extension stroke of the damping piston is not possible.
Ein weiterer Nachteil dieses in einem Schwingungsdämpfer exakt arbeitenden Sensors, der aus einer in der Abdeckung befindlichen Spule und einem Führungsverschluß des Dämpferzylinders angeordneten Dauermagneten besteht, liegt darin, daß dieser Sensor bei einem Einsatz in einem Federbein zu Meßungenauigkeiten, die die Regelung unbrauchbar machen, führen würde, da die bei einem Federbein auf dem Federteller des Außenrohrs aufsitzende Schraubenfeder hier ebenfalls als Spule wirkt. Durch die Relativbewegung zwischen der Schraubenfeder und der Sensorwicklung und die sich verändernde Wicklungsweite der Schraubenfeder entsteht eine veränderliche Störinduktion, die durch die Auswerteelektronik nicht kompensiert werden kann.Another disadvantage of this sensor working precisely in a vibration damper, which consists of a permanent magnet arranged in the cover and a guide lock of the damper cylinder, is that this sensor leads to measurement inaccuracies when used in a shock absorber, which render the control unusable would, since the helical spring on a spring strut on the spring plate of the outer tube also acts here as a coil. The relative movement between the helical spring and the sensor winding and the changing winding width of the helical spring result in a variable interference induction that cannot be compensated for by the evaluation electronics.
Andererseits werden bei Federbeinen oft wegen des Platzbedarfs keine Abdeckungen sondern biegsame Falten aufweisende Gummischutzrohre verwendet, die eine Anordnung der Sensorwicklung gemäß dem Stand der Technik nicht zulassen.On the other hand, in the case of spring struts, because of the space requirement, it is often not the case that covers are used, but flexible protective rubber pipes which have folds and which do not permit an arrangement of the sensor winding in accordance with the prior art.
Die DE-OS 29 11 768 zeigt eine Kombination aus mehreren Sensorwicklungen und Dauermagneten zur Messung der Endposition und zur Messung der Bewegung bzw. der Geschwindigkeit der relativ zueinander sich bewegenden Teile. Hierbei ist das Sensorsystem zur Messung der Endposition, d.h. des Grenzwertes, als eine aus wenigen Windungen ausgebildete Spule mit einem zugehörigen Magneten und das System zur Messung der Geschwindigkeit als eine über eine große Länge ausgebildete weitere Sensorwicklung mit zugehörigem Magneten ausgebildet.DE-OS 29 11 768 shows a combination of several sensor windings and permanent magnets for measuring the end position and for measuring the movement or the speed of the parts moving relative to one another. Here, the sensor system for measuring the end position, ie the limit value, is a coil formed from a few turns with an associated magnet and the system for measuring the speed is designed as a further sensor winding with a corresponding magnet which is formed over a long length.
Eine solche Ausbildung erfordert eine relativ aufwendige Herstellung des gesamten Dämpfers und erfordert unterschiedliche Spulen und Zuleitungssysteme, die aufgrund der dadurch sich verändernden Baugröße als nachteilig anzusehen sind.Such a design requires a relatively complex manufacture of the entire damper and requires different coils and supply systems, which are to be regarded as disadvantageous due to the size that changes as a result.
Der Erfindung liegt die Aufgabe zugrunde, einen Sensor für einen Schwingungsdämpfer und ein Federbein eines Kraftfahrzeuges zu schaffen, mit dem neben der Relativgeschwindigkeit zwischen Aufbau und Achse auch die Endposition des Ein- und Ausfahrhubes gemessen werden kann.The invention has for its object to provide a sensor for a vibration damper and a shock absorber of a motor vehicle with which, in addition to the relative speed between the body and the axle, the end position of the entry and exit stroke can also be measured.
Die Aufgabe wird durch einen Sensor zur Messung der Relativgeschwindigkeit und/oder der Stellung zwischen einem Dämpferzylinder und einem sich in diesem bewegenden Dämpfungskolben nach den Merkmalen der Patentansprüche gelöst.The object is achieved by a sensor for measuring the relative speed and / or the position between a damper cylinder and a damping piston moving in it according to the features of the claims.
Bei einem Sensor für einen Schwingungsdämpfer kann die Sensorwicklung von der mit der Kolbenstange verbundenen Abdeckung aufgenommen und der Dauermagnet an oder in der Wandung des Dämpferzylinders angeordnet werden. Eine weitere Möglichkeit besteht darin, die Sensorwicklung in die aus nichtmagnetisierbarem Material bestehende Wandung des Dämpferzylinders einzubringen oder bei einem Zweirohrdämpfer zwischen der Wandung des Dämpferzylinders und dem Außenrohr anzuordnen und den Dauermagneten mit dem Dämpfungskolben oder mit dem in den Dämpferzylinder eintauchenden Teil der Kolbenstange zu verbinden.In the case of a sensor for a vibration damper, the sensor winding can be received by the cover connected to the piston rod and the permanent magnet can be arranged on or in the wall of the damper cylinder. Another option is there This involves inserting the sensor winding into the wall of the damper cylinder made of non-magnetizable material or, in the case of a two-tube damper, arranging it between the wall of the damper cylinder and the outer tube and connecting the permanent magnet to the damping piston or to the part of the piston rod immersed in the damper cylinder.
Bei einem Federbein umgibt die Sensorwicklung vorzugsweise die Kolbenstange unterhalb des Zuganschlages und der Dauermagnet ist an oder in der Wandung des Zylinderrohrs angeordnet. Die elektrischen Anschlüsse sind durch die hohle Kolbenstange nach außen geführt.In the case of a spring strut, the sensor winding preferably surrounds the piston rod below the pull stop and the permanent magnet is arranged on or in the wall of the cylinder tube. The electrical connections are led through the hollow piston rod to the outside.
Eine weitere Ausführung des Sensors für ein Federbein besteht darin, die Sensorwicklung axial in der hohlen Kolbenstange anzuordnen, wenn diese aus einem nichtmagnetisierbaren Material besteht. Wurde der Dämpferzylinder aus einem nichtmagnetisierbaren Material gefertigt, ist es günstig, den Dauermagneten an der Außenwandung des Dämpferzylinders oder an der Innenwandung des Außenrohrs zu befestigen, wobei auch die entgegengesetzte Ausführung, die als zylindrische Spule ausgebildete Sensorwicklung zwischen Außenwandung des aus nichtmagnetisierbarem Material bestehenden Dämpferzylinders und der Innenwandung des Außenrohrs und den Dauermagneten an der Kolbenstange anzuordnen, möglich ist.A further embodiment of the sensor for a shock absorber is to arrange the sensor winding axially in the hollow piston rod if it consists of a non-magnetizable material. If the damper cylinder was made of a non-magnetizable material, it is convenient to attach the permanent magnet to the outer wall of the damper cylinder or to the inner wall of the outer tube, with the opposite design, the sensor winding being a cylindrical coil between the outer wall of the damper cylinder made of non-magnetizable material and to arrange the inner wall of the outer tube and the permanent magnet on the piston rod is possible.
Die Endstellung des Ein- und Ausfahrhubes angebende, getrennt abgreifbare, erhöhte induzierte Spannung an den Enden der Sensorwicklung wird durch eine erhöhte Windungszahl je Längeneinheit in den Endbereichen realisiert. Eine weitere vorteilhafte Ausführungsform besteht darin, die Sensorwicklung in den Endbereichen mehrlagig zu wickeln oder die Windungen dichter zu legen.The end position of the entry and exit stroke indicating separately tapped, increased induced voltage at the ends of the sensor winding is realized by an increased number of turns per unit length in the end regions. Another advantageous embodiment consists of winding the sensor winding in multiple layers in the end regions or making the windings closer together.
Ein sehr genaues Meßsignal wird erhalten, wenn das den Dauermagneten tragende Teil und das die Sensorwicklung tragende Teil für das Magnetfeld des Dauermagneten einen geschlossenen magnetischen Kreis bilden und der beispielsweise als Ringmagnet ausgebildete Dauermagnet in Anordnung zur Kolbenstange radial polarisiert ist.A very accurate measurement signal is obtained when the part carrying the permanent magnet and the part carrying the sensor winding form a closed magnetic circuit for the magnetic field of the permanent magnet and the permanent magnet, for example in the form of a ring magnet, is radially polarized in an arrangement relative to the piston rod.
Der Dauermagnet kann jedoch auch aus ringförmig angeordneten Einzelmagneten bestehen.However, the permanent magnet can also consist of individual magnets arranged in a ring.
Der erfindungsgemäße, einfach aufgebaute, passive Sensor kann ohne Minderung der Gleitlänge des Schwingungsdämpfers oder des Federbeins eingesetzt werden.The simply constructed passive sensor according to the invention can be used without reducing the sliding length of the vibration damper or the shock absorber.
Die Erfindung wird anhand eines Ausführungsbeispiels näher erläutert. Die zugehörigen Zeichnungen zeigen:
- Fig. 1
- einen Schwingungsdämpfer mit einem Sensor, bei dem die Sensor- und Meßwicklungen in der Abdeckung angeordnet sind und der Dauermagnet mit dem Dämpferzylinder verbunden ist,
- Fig. 2
- ein Detail mit dem oberen Abschnitt der Sensorwicklung und einem Dauermagnet mit Zwischenlage,
- Fig. 3
- einen Schwingungsdämpfer ohne Abdeckung mit einem Sensor, bei dem die Sensor- und Meßwicklungen auf dem Dämpferzylinder aufgebracht sind und der Dauermagnet an der beweglichen Kolbenstange befestigt ist,
- Fig. 4
- einen Schwingungsdämpfer mit einem Sensor, bei dem die Sensor- und Meßwicklungen auf dem Dämpferzylinder aufgebracht sind und der Dauermagnet sich in der Abdeckung befindet,
- Fig. 5
- ein Federbein mit einem Sensor, bestehend aus den die Kolbenstange umgebenden Sensorwicklungen und einem mit dem Zylinderrohr verbundenen Dauermagneten,
- Fig. 6
- ein Federbein mit einem Sensor, bestehend aus den in der hohlen Kolbenstange angeordneten Sensorwicklungen und einem mit dem Zylinderrohr verbundenen Dauermagneten,
- Fig. 7
- ein Federbein mit einem Sensor, bestehend aus den an der Außenwandung des Zylinderrohrs angeordneten Sensor- und Endwicklungen und einem mit der Kolbenstange verbundenen Dauermagneten,
- Fig. 8
- Ausschnitt aus einem Schwingungsdämpfer mit Sensor auf der Innenwandung der Abdeckung und radial polarisiertem Dauermagneten.
- Fig. 1
- a vibration damper with a sensor in which the sensor and measuring windings are arranged in the cover and the permanent magnet is connected to the damper cylinder,
- Fig. 2
- a detail with the upper section of the sensor winding and a permanent magnet with an intermediate layer,
- Fig. 3
- a vibration damper without cover with a sensor, in which the sensor and measuring windings are applied to the damper cylinder and the permanent magnet is attached to the movable piston rod,
- Fig. 4
- a vibration damper with a sensor in which the sensor and measuring windings are applied to the damper cylinder and the permanent magnet is located in the cover,
- Fig. 5
- a spring strut with a sensor, consisting of the sensor windings surrounding the piston rod and a permanent magnet connected to the cylinder tube,
- Fig. 6
- a spring strut with a sensor, consisting of the sensor windings arranged in the hollow piston rod and a permanent magnet connected to the cylinder tube,
- Fig. 7
- a spring strut with a sensor, consisting of the sensor and end windings arranged on the outer wall of the cylinder tube and a permanent magnet connected to the piston rod,
- Fig. 8
- Section of a vibration damper with sensor on the inside wall of the cover and radially polarized permanent magnet.
Der in Figur 1 dargestellte hydraulische, regelbare Schwingungsdämpfer besteht im wesentlichen aus einem Dämpferzylinder 1, der durch einen Führungsverschluß 5 verschlossen ist, einem mit einer Kolbenstange 2 verbundenen Dämpferkolben 3 und einer mit der Kolbenstange 2 verbundenen, aus nichtmagnetisierbarem Material bestehenden Abdeckung 4. Im Dämpferzylinder 1 befinden sich zwei Arbeitsräume, die durch den Trennkolben 6 von einem gasgefüllten Ausgleichsraum, welcher zur Kompensation der Volumenzu- bzw. -abnahme im hydraulischen Arbeitsraum durch das ein- bzw. ausfahrende Eigenvolumen der Kolbenstange 2 dient, getrennt werden. Oberhalb des Trennkolbens 6 befindet sich der Dämpferkolben 3, fest verbunden mit der beweglichen Kolbenstange 2, die durch den Führungsverschluß 5 hindurch gleitet und von einer Dichtung abgedichtet wird. Die aus nichtmagnetisierbarem Material bestehende Abdeckung 4 ist derart ausgebildet, daß sie einseitig offen und über den Dämpferzylinder 1 gestülpt ist. In der Abdeckung 4 befindet sich eingebettet eine einteilige Sensorwicklung 9, die sich über die gesamte Länge der Abdeckung 4 erstreckt. Weiterhin liegen zwei einteilig mit der Sensorwicklung 9 ausgebildete Meßwicklungen 7, 8 am unteren und oberen Ende der Abdeckung 4 auf der Sensorwicklung 9. Die Länge dieser Meßwicklungen 7, 8 ist gegenüber der Länge der Sensorwicklung 9 klein. Der durch die Sensor- und Meßwicklungen hindurchgleitende Dauermagnet 10 wurde auf dem Führungsverschluß 5 angeordnet. Zwischen dem Dauermagneten 10 und den Sensor- 9 und Meßwicklungen 7, 8 befindet sich ein Luftspalt.The hydraulic, controllable vibration damper shown in Figure 1 consists essentially of a
Wird nun aufgrund einer Fahrbahnunebenheit der Dämpferzylinder 1 nach oben gedrückt, bewegt sich der Dauermagnet 10 innerhalb der ihn umgebenden Sensorwicklung 9 nach oben und es wird in der Sensorwicklung 9 eine Spannung induziert. Dieses Spannungssignal ist innerhalb der Sensorwicklung 9 proportional zur Relativgeschwindigkeit von Dämpferzylinder 1 und Kolben 3. Gelangt der Dauermagnet 10 jedoch an das Ende der Sensorwicklung 9, wird in der Meßwicklung 7 eine Spannung induziert, die die Endlage des Dauermagneten 10 und damit die zulässige Endlage des Dämpferkolbens 3 signalisiert.If the
Die untere mögliche Ausfahrposition wird auf die gleiche Weise durch die untere Meßwicklung 8 erfaßt. Zur Auswertung der induzierten Spannung werden die Anschlüsse der Sensor- und Meßwicklungen auf eine nicht dargestellte Auswerteelektronik geführt.The lower possible extension position is detected in the same way by the lower measuring winding 8. To evaluate the induced voltage, the connections of the sensor and measuring windings are led to evaluation electronics, not shown.
Das in Fig. 2 gezeigte Detail verdeutlicht den Aufbau des oberen Teils der mit der Meßwicklung 7 einteilig ausgeführten Sensorwicklung 9, wobei der Abgriff 14 der Meßwicklung 7 und der Anschluß 13 der Sensorwicklung 9 nach außen geführt sind. Außerdem kann es sinnvoll sein, zwischen dem Führungsverschluß 5 und dem Dauermagneten 10 eine nicht magnetisierbare Zwischenlage 12 anzuordnen, die verhindert, daß die Magnetkraft durch das Eisen des Dämpferzylinders geschwächt wird.The detail shown in FIG. 2 illustrates the structure of the upper part of the sensor winding 9, which is made in one piece with the measuring winding 7, the tap 14 of the measuring winding 7 and the
In Fig. 3 wird ein Schwingungsdämpfer ohne Abdeckung gezeigt. Hier befindet sich das System aus Sensor- und Meßwicklungen auf der Wandung des aus nichtmagnetisierbarem Material bestehenden Dämpferzylinders 1 und wurde zum Schutz gegen äußere Einflüsse mit einem Dielektrikum umhüllt. Denkbar wäre auch, die Sensor- und Meßwicklungen direkt in der Wandung des Dämpferzylinders 1 anzuordnen. Der Dauermagnet 10 zur Erzeugung der Induktionsspannung befindet sich am Dämpferkolben 3 oder am unteren Teil der Kolbenstange 2. Auch hier wird in der Sensorwicklung 9 eine Spannung proportional zur Relativgeschwindigkeit und in den Meßwicklungen 7 und 8 ein Erkennungssignal für die Endstellungen des Ein- und Ausfahrhubes induziert.3 shows a vibration damper without a cover. Here the system of sensor and measuring windings is located on the wall of the
Die Fig. 4 zeigt einen Schwingungsdämpfer, der entgegengesetzt aufgebaut ist. Die mit den Meßwicklungen 7, 8 einteilig ausgebildete Sensorwicklung 9 befindet sich auf oder in der aus nichtmagnetisierbarem Material bestehenden Wandung des Dämpferzylinders 1. Der insbesondere als Ringmagnet ausgebildete Dauermagnet 10 wurde an der Abdeckung 4 angeordnet und ist somit über diese mit der Kolbenstange 2 verbunden. Aufgrund des gleichen Induktionsprinzipes wird bei einer Relativbewegung zwischen Dämpferzylinder 1 und Dämpferkolben 3 in der Sensorwicklung 9 eine der Relativgeschwindigkeit proportionale Spannung induziert und beim Passieren der Meßwicklung 7 oder 8 durch den Dauermagneten 10 ein Kennungssignal für die Endstellungen des Dämpferkolbens 3 erzeugt. Beim Erreichen einer der beiden Endstellungen des Ein- bzw. Ausfahrhubes kann somit über eine Regelung die Dämpfung auf einen höheren Dämpfungswert geschaltet werden, der Dämpfungszylinder fährt langsamer auf den Puffer 11 auf und ein Durchschlagen des Schwingungsdämpfers wird verhindert.Fig. 4 shows a vibration damper, which is constructed in opposite directions. The sensor winding 9 formed in one piece with the measuring
Ein nach dem Zweirohrprinzip arbeitendes, in Fig. 5 dargestelltes Federbein besteht aus dem Arbeitsraum 18, der durch den Dämpferzylinder 1 gebildet wird und am unteren Ende durch das Bodenventil 19 und oben durch den Führungsverschluß 5 begrenzt wird. Im Führungsverschluß 5 gleitet die Kolbenstange 2, die im Arbeitsraum den mit steuer- oder regelbaren Ventilen ausgestatteten Dämpfungskolben 3 aufnimmt. Der Dämpferzylinder 1 wird von einem Außenrohr 17 umgeben, zwischen beiden befindet sich der Ausgleichsraum 20, der etwa bis auf halbe Höhe mit Öl gefüllt ist, während der Arbeitsraum 18 volle Ölfüllung aufweist. Das Außenrohr 17 verbindet den Führungsverschluß 5 mit der das Bodenventil 19 abstützenden Bodenkappe 21 und trägt den eine nicht dargestellte Schraubenfeder aufnehmenden Federteller 22. Zur Begrenzung des Rad-Ausfederungsweges trägt die Kolbenstange 2 einen Zuganschlag 16. Die als zylindrische Spule und mit den Meßwicklungen 7,8 einteilig ausgebildete Sensorwicklung 9 umgibt die Kolbenstange unterhalb des Zuganschlages 16. Die Länge dieser Wicklungen 7, 8 ist gegenüber der Länge der Sensorwicklung 9 klein. Der die Sensorwicklung 9 und die Wicklungen 7, 8 umgebende, zum Beispiel als Ringmagnet ausgeführte Dauermagnet 10 wurde an der Innenwandung des Dämpferzylinders 1 angeordnet. Besteht der Dämpfungszylinder 1 aus nichtmagnetisierbarem Material, kann der Dauermagnet 10 zwischen der Außenwandung des Dämpferzylinders 1 und der Innenwandung des Außenrohrs 17 angeordnet werden.5 consists of the working
Federt nun aufgrund einer Fahrbahnunebenheit das Rad aus, wird der Dämpferzylinder 1 zusammen mit dem Außenrohr 17 nach unten gezogen und der Dauermagnet 10 bewegt sich um die Sensorwicklung 9 nach unten. Durch diese Bewegung induziert er in der Sensorwicklung 9 eine Spannung proportional zur Relativgeschwindigkeit zwischen dem Dämpfungskolben 3 und dem Dämpferzylinder 1. Gelangt der Dauermagnet 10 jedoch an das Ende der Sensorwicklung 9, wird auch in der Wicklung 7 eine Spannung induziert, die die Endlage des Dauermagneten und damit die zulässige Endlage des Ausfederungsweges signalisiert. Die zulässige Endlage des Einfederungsweges wird durch die Wicklung 8 angezeigt.If the wheel springs out due to an uneven road surface, the
Das Federbein in Fig. 6 weist einen ähnlichen Aufbau wie das Federbein in Fig. 5 auf. Die Kolbenstange 2 wurde hier aus nichtmagnetisierbarem Material, zum Beispiel aus nichtmagnetisierbarem Chrom - Nickel - Stahl, gefertigt und die Sensorwicklung 9 mit den Wicklungen 7, 8 zur Erfassung der Endpositionen des Ein- und Ausfahrhubes axial in der hohlen Kolbenstange 2 angeordnet. Die Anschlüsse der Wicklungen werden zusammen mit den Anschlüssen 24 des steuerbaren Magnetventils 23 in der hohlen Kolbenstange nach außen geführt. Der Dauermagnet 10 zur Erzeugung der Induktionsspannung befindet sich auch hier an der Innenwandung des Dämpferzylinders 1.The suspension strut in FIG. 6 has a similar structure to the suspension strut in FIG. 5. The
Fig. 7 zeigt ein Federbein, das entgegengesetzt aufgebaut ist. Die Sensorwicklung 9 und die Wicklungen 7, 8 zur Erfassung des Ein- und Ausfahrhubes liegen an der Außenwandung des aus nichtmagnetisierbarem Material bestehenden Dämpferzylinders 1, wobei denkbar wäre, die Wicklungen auch an der Innenwandung des Außenrohrs 17 anzuordnen. Die Anschlüsse 10 der Wicklungen wurden bei dieser Lösung im Ausgleichsraum 20 nach außen geführt und mit einem im Führungsverschluß 5 angeordneten mehrpoligen Stecker 25 verbunden. Der vorzugsweise als Ringmagnet ausgebildete Dauermagnet 10 umschließt fest die Kolbenstange 2 oberhalb des Magnetventils 23. Aufgrund des gleichen Induktionsprinzipes wird bei einer Relativbewegung zwischen Dämpferzylinder 1 und dem mit der Kolbenstange 2 verbundenen Dämpfungskolben 3 in der Sensorwicklung 9 eine der Relativgeschwindigkeit proportionale Spannung induziert und beim Passieren der Wicklung 7 oder 8 durch den Dauermagnet 10 ein Kennungssignal für die Endstellungen des Dämpfungskolben 6 erzeugt. Beim Erreichen einer der beiden Endstellungen des Ein- und Ausfahrhubes kann somit über eine Regelung die Dämpfung auf einen höheren Dämpfungswert geschaltet werden und der Zuganschlag 16 führt langsamer auf den am Führungsverschluß 5 angeordneten Puffer auf.Fig. 7 shows a shock absorber, which is constructed in opposite directions. The sensor winding 9 and the
Bei den in Fig. 5 und Fig. 7 gezeigten Varianten ist es nicht zwingend, die Kolbenstange 2 aus nichtmagnetisierbarem Material zu fertigen, da bei der Sensierung der Einfluß der Kolbenstange 2 als berechenbare Größe eingeht, die in der nicht dargestellten Auswerteschaltung eliminiert werden kann. Ebenso kann der Einfluß des Dämpferzylinders 1 der Varianten in Fig. 5 und 6 errechnet und kompensiert werden.In the variants shown in FIGS. 5 and 7, it is not imperative to manufacture the
Der in Fig. 8 im Ausschnitt dargestellte hydraulische Schwingungsdämpfer besteht im wesentlichen aus einem Dämpfungszylinder 1, der durch einen Führungsverschluß 5 verschlossen ist, einer im Dämpferzylinder 1 geführten, aus Stahl bestehenden Kolbenstange 2, die an ihrem unteren Ende einen nicht dargestellen Dämpfungskolben trägt, und einer über den Dämpfungszylinder 1 gestülpten, einseitig offenen Abdeckung 4. Der in dem Schwingungsdämpfer integrierte sehr genau arbeitende Sensor zur Messung der Relativgeschwindigkeit und/oder der Kolbenstellung im Dämpferzylinder 1 besteht aus einem radial zur Kolbenstange 2 polarisierten, als Ringmagneten ausgebildeten Dauermagneten 10, der durch eine Scheibe 26 aus nichtferromagnetischem Material, zum Beispiel Aluminium, magnetisch von dem üblicherweise aus Stahl bestehenden Dämpferzylinder 1 getrennt ist. Bei einem Dämpferzylinder 1 und einem Führungsverschluß 5 aus Aluminium kann diese Scheibe wegfallen, der Dauermagnet 10 kann dann im Führungsverschluß 5 integriert sein. Die mit dem Dauermagneten 10 zusammenwirkende Sensorwicklung 9 mit an ihren Enden angeordneten Meßwicklungen 7, 8 wird an der Innenwandung der aus einem ferromagnetischen Material, üblicherweise Stahl, bestehenden Abdeckung 4 angeordnet.The hydraulic vibration damper shown in Fig. 8 consists essentially of a damping
Bewegt sich aufgrund einer Fahrbahnunebenheit der Dämpferzylinder 1 relativ zur Kolbenstange 2 und damit zu der mit dieser in Wirkverbindung stehenden Sensorwicklung 9 und den Meßwicklungen 7, 8, induziert das magnetische Feld des Dauermagneten 10 in der Sensorwicklung 9 eine Spannung aufgrund des geschlossenen magnetischen Kreises, der durch den radial polarisierten Dauermagneten, die Kolbenstange und die Abdeckung gebildet wird, die sehr genau proportional der Relativgeschwindigkeit von Fahrzeugaufbau und -achse ist. In den Meßwicklungen 7, 8 wird damit ein exaktes Signal zur Erkennung der Endstellungen des Dämpfungskolbens 3 erhalten.If the
Magnetische Streuflüsse, die zu einer Ungenauigkeit des Meßergebnisses führen können, treten nicht auf.Magnetic stray fluxes, which can lead to an inaccuracy of the measurement result, do not occur.
- 11
- DämpferzylinderDamper cylinder
- 22nd
- KolbenstangePiston rod
- 33rd
- DämpfungskolbenDamping piston
- 44th
- Abdeckungcover
- 55
- FührungsverschlußGuide lock
- 66
- TrennkolbenSeparating piston
- 77
- MeßwicklungMeasuring winding
- 88th
- MeßwicklungMeasuring winding
- 99
- SensorwicklungSensor winding
- 1010th
- DauermagnetPermanent magnet
- 1111
- Pufferbuffer
- 1212th
- ZwischenlageLiner
- 1313
- AnschlußConnection
- 1414
- AbgriffTap
- 1515
- Anschlüsse der SensorwicklungSensor winding connections
- 1616
- ZuganschlagTrain stop
- 1717th
- AußenrohrOuter tube
- 1818th
- Arbeitsraumworking space
- 1919th
- BodenventilBottom valve
- 2020th
- AusgleichsraumCompensation room
- 2121
- BodenkappeBottom cap
- 2222
- FedertellerSpring plate
- 2323
- Steuerbares MagnetventilControllable solenoid valve
- 2424th
- Anschlüsseconnections
- 2525th
- mehrpoliger Steckermulti-pin connector
- 2626
- Scheibedisc
Claims (19)
- A sensor in a shock absorber for a motor vehicle for measuring the relative velocity and/or the position between a damper cylinder and a damper piston which is connected to a piston rod and moves inside this damper cylinder, the damper piston being part of a shock absorber for motor vehicles, the sensor comprising a permanent magnet and a sensor winding designed as a cylindrical coil which has connections fitted to its ends and interacts with the permanent magnet, characterised in that the sensor winding (9) is formed as a single piece and is constructed in such a way that an increased induced voltage can be separately measured at a short winding component (7,8) at the ends of the sensor winding.
- A sensor as claimed in claim 1 characterised in that the permanent magnet is connected to the damper cylinder and the sensor winding (9) is fitted on the internal wall of a covering (4) connected to the piston rod (2).
- A sensor as claimed in claim 1 characterised in that the permanent magnet is connected to the damper cylinder and the sensor winding (9) is fitted on or in the wall of a covering (4) which is manufactured from non-magnetic material and is connected to the piston rod (2).
- A sensor as claimed in claim 1 characterised in that the permanent magnet is operatively connected to the piston rod or the damper piston and the sensor winding is operatively connected to the damper cylinder.
- A sensor as claimed in claim 4 characterised in that the permanent magnet (10) is attached to the covering (4) which is connected to the piston rod (2).
- A sensor as claimed in claim 4 or 5 characterised in that the sensor winding (9) is fitted in or on the external wall of the damper cylinder (1) manufactured from non-magnetic material.
- A sensor as claimed in claim 4 or 5 characterised in that in a two pipe damper, the sensor winding (9) is fitted on or within the wall of the external pipe.
- A sensor as claimed in claim 1 characterised in that the sensor winding (9), which is formed as a cylindrical coil, is fitted within the damper cylinder (1) and is operatively connected to the piston rod (2).
- A sensor as claimed in claim 8 characterised in that the sensor winding (9) surrounds the piston rod (2) below the traction stop (16).
- A sensor as claimed in claim 1 or 8 characterised in that piston rod (2) is manufactured of non-magnetic material and the sensor winding (9) is fitted in the hollow piston rod (2).
- A sensor as claimed in one or more of the claims 8 through 10 characterised in that the permanent magnet (10) is fitted on or in the internal wall of the damper cylinder (1).
- A sensor as claimed in one or more of the claims 8 through 10 characterised in that in a shock absorber leg where the damper cylinder (1), manufactured from non-magnetic material, is surrounded by an external pipe (17), the permanent magnet (10) is fitted on the external wall of the damper cylinder (1) or on the internal wall of the external pipe (17).
- A sensor as claimed in one or more of the claims 1 through 12 characterised in that the short winding components (7, 8) of the sensor winding comprise a greater number of turns per unit of length.
- A sensor as claimed in one or more of the claims 1 through 12 characterised in that the winding components (7, 8) of the sensor winding are wound in multiple layers.
- A sensor as claimed in one or more of the claims 1 through 12 characterised in that the short winding components (7, 8) of the sensor winding are wound more closely than the middle regions of the sensor winding.
- A sensor as claimed in one or more of the claims 1 through 15 characterised in that the permanent magnet (10) is formed as a ring magnet.
- A sensor as claimed in one or more of the claims 1 through 15 characterised in that the permanent magnet (10) consists of individual magnets arranged in the shape of a ring.
- A sensor as claimed in one or more of the claims 1 through 17 characterised in that the permanent magnet (10) is radially polarised in relation to the piston rod (2).
- A sensor as claimed in one or more of the claims 1 through 18 characterised in that the component supporting the permanent magnet (10) and the component supporting the sensor winding (9) form a complete magnetic circuit for the magnetic field of the permanent magnet.
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4036704 | 1990-11-17 | ||
DE19904036704 DE4036704A1 (en) | 1990-11-17 | 1990-11-17 | Sensor in motor vehicle vibration damper - contains sensor coil, permanent magnet, and measures relative speed and stroke |
DE19914107290 DE4107290C1 (en) | 1991-03-07 | 1991-03-07 | |
DE4107290 | 1991-03-07 | ||
DE4126586A DE4126586A1 (en) | 1991-08-12 | 1991-08-12 | SENSOR IN A VIBRATION DAMPER FOR MOTOR VEHICLES |
DE4126586 | 1991-08-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0486848A1 EP0486848A1 (en) | 1992-05-27 |
EP0486848B1 true EP0486848B1 (en) | 1997-06-04 |
Family
ID=27201905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91118384A Expired - Lifetime EP0486848B1 (en) | 1990-11-17 | 1991-10-29 | Relative speed or position for a damper piston moving inside a damper body |
Country Status (6)
Country | Link |
---|---|
US (1) | US5233293A (en) |
EP (1) | EP0486848B1 (en) |
JP (1) | JPH04266633A (en) |
KR (1) | KR920010287A (en) |
DE (1) | DE59108738D1 (en) |
ES (1) | ES2032189T3 (en) |
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- 1991-10-29 EP EP91118384A patent/EP0486848B1/en not_active Expired - Lifetime
- 1991-10-29 DE DE59108738T patent/DE59108738D1/en not_active Expired - Fee Related
- 1991-10-29 ES ES91118384T patent/ES2032189T3/en not_active Expired - Lifetime
- 1991-11-12 JP JP3295456A patent/JPH04266633A/en active Pending
- 1991-11-15 KR KR1019910020348A patent/KR920010287A/en not_active Application Discontinuation
- 1991-11-15 US US07/792,424 patent/US5233293A/en not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
ES2032189T3 (en) | 1997-10-01 |
JPH04266633A (en) | 1992-09-22 |
ES2032189T1 (en) | 1993-01-16 |
EP0486848A1 (en) | 1992-05-27 |
DE59108738D1 (en) | 1997-07-10 |
KR920010287A (en) | 1992-06-26 |
US5233293A (en) | 1993-08-03 |
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